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(No Model.) 2 Sheets-Sheet 1'.

S. E; BEEDY.

TELEPHONIG TRANSMITTER.

No. 266,747. Patented Oct. 31, 1882.

Qgmpher. Washmslulh n. c.

2 Sheets-Sheet 2.-

(No Model.)

S. .E. BEEDY.

TELEPHONIO TRANSMITTER.

Patented Oct. 31, 1882.

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UNITED STATES PATENT @TTTCE.

SETH E. BEEDY, OF FARMINGTON, MAINE, ASSIGNOR or ONE-HALF 'lO JOHN J.LINSCOTT, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 266,747, dated October81, 18$ 2.

Application filed June 13, 1882.

To all whom it may concern Be it known that I, SETH E. BEEDY, a citizenof the United States, residing at Farmington, in the county of Franklinand State of Maine, have invented new and useful 1mprovements inTelephon-ic Transmitters, of which the following is a specification.

My invention relates to electric telephones; and it consists, first, ina diaphragm formed of wood or other suitable material, with one of thecarbons mounted therein and extending over the entire area of the box,with a mouth-piece mounted upon a hinged door, which is wholly distinctand separate from 1 the diaphragm, whereby the entire surface of thelatter may be exposed when desired; second,in the employment of twocarbons,one mounted upon the diaphragm and the other upon an adjustablespring-plate connected with the box or case, and having a screw bearingupon its bent end, whereby the carbon upon the arm may be thrown againstthe carbon on the diaphragm.

Referring to the drawings making part of 2 this application, Figure 1 isa front elevation of the telephone-box. Fig. 2 is a rear elevation ofthe same, part of the casing being broken away to show thecircuit-breaking device. Fig. 3 is a vertical section taken through the0 center of the box. Fig. 4 is a View of the circuit-breaking device.Fig. 5 is a front elevation of the case, showing the hinged door openand the telephone attached. Fig. 6 is a longitudinal central section ofthe receiver.

Fig. 7 is a detail view of the diaphragm used in the receiver.

A in said drawings indicates the telephone box or casing, which may beof any desired form or size. As shown in the drawings, it

is square; but it may be either round or poly onal.

Upon the front of the box is placed a diaphragm, B, which extends overthe entire area bounded by the walls of said box, and is 5 fastened inplace by strips a, laid upon the edge or edges of the diaphragm, andhaving screws which pass through the strips and the diaphragm into thewalls of the box. This diaphragm is made of wood, and preferably (Nomodcl.)

of spruce, although other varieties may prove equally good. Itsthickness may be varied; but experience has shown that a diaphragm aboutone-eighth of an inch in thickness will give good results.

In front of the diaphragm B is placed a door, U, wholly separatetherefrom, and carrying the mouth piece 1), which is of the usual form,and placed at the middle point, or thereabout, ofthe diaphragm. Thisdoor is hinged to the box upon one of its vertical sides, so as to swingopen and expose the entire surface ofthe diaphragm, as shown in Fig. 5.

Upon the rear surface of the diaphragm B, at or about its central point,I place a carbon, E, mounted on any suitable seat, I), which in thepresent instance is made of brass and screwed to the diaphragm.

Directly in rear of the carbon E, I place a second carhon,F, which ismounted upon .a spring-arm, G, connected with the box by means of ascrew or screws, 0, and adjusted relatively to the carbon E by aset-screw, H, which passes through the wall of the box and hasits endbearing against the bent end (I of the spring-arm G. It is evident thatby turning said set-screw the carbon F is thrown against the carbon E,while by retracting said screw the elasticity of the spring-arm willwithdraw it from said carbon. The arm G being provided with a bent end,(1, and the attaching screw or screws 0 being set close to the acuteangle formed by said bend, when the screw is driven tightly up, its headbearing against the surface of the part d will tend to throw it flatagainst the wall of the case or box. This will draw the carbon F awayfrom the carbon E, and the action of the set-screw H, forcing said bentend down, will cause the carbon F to approach the carbon E. The range ofadjustment, being extremely small, can easily be offected by means ofthis construction and arrangement of parts.

The connections in this telephone are not substantially different fromthose already known.

The local 'or primary circuit is as follows: The wire 0 from one pole ofthe battery passes to the binding-post f, through the breaker,

and thence to the carbon on the diaphragm, and from the electrode F onthe spring-arm to the primary of the induction-coil I, thence tobinding-post f, and thence back to the battery. One terminal of the coilon the receiver is connected to binding post g, and passes thence tobinding-post h, thence to the second: ary of the induction-coil, andfrom there to binding-posts h and g, and thence to coil in the receiver.The line-wires are connected to binding-posts h and h. Thetelephone-receiver is connected to the binding-posts g and g.

The breaker'which is shown in Figs. 2 and 8 and in detail in Fig. 4consists of any suitable device for interrupting the local circuit. Inthis case it consists of a hook or support, L, adapted to receive thering M on the extremity of the handle of the receiver. Above this hookis placed a latch, N, forming part of a springplate, 0, secured to thebox, and which in its normal position lies in contact with theconnection 1?. When the receiver is placed on the hook the ring M pushesthe latch N upward, and thereby raises the plate 0 and breaks thecircuit. WVhen the receiver is taken from the hook the elasticity of theplate I throws it down into contact with the connection P.

I propose to use in connection with this telephone the receiver shown inFig. 6, having a perforated diaphragm, and the permanent magnet, with aseparable softiron core, all of which are shown and claimed in anapplication filed by me of even date herewith, and therefore forming nopart of the invention comprised in this application.

By forming the diaphragm of wood I secure increased sensitiveness andintensity of action, and by mounting the mouth-piece upon 0 constructionand better results in operation.

What I claim is- 1. The combination, with the wooden diaphragm, of thetwo carbons, one mounted upon the central part thereof, and the othersupported by an arm, Gr attached to the box, said arm having a bent end,(I, and a setscrew, H, bearing against the end 01, whereby the saidcarbon may be adjusted toward the diaphragm, substantially as described.

2. The combination, with the hinged door carrying the mouth-piece, ofthe separate dia phragm covering the whole face of the box, the carbonmounted thereon, the second carbon mounted on a spring-arm, and asetscrew bearing against the bent end of said arm, substantially as andfor the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

SETH E. BEEDY.

Witnesses 1 JAMES L. NORRIS, ALBERT H. NORRIS.

